Long-burning arc-lamp.



PATENTED SEPT. 3, 1907. El

Q J. RDSEMEYBR & G. DIV

LONG BURNING ARC LA APPLIOATION FILLED MAR. 7, 1905.

2 sums-sum 1.

q/Vi In and No. 865,271. PA'TEN'TED SEPT. 3, 1907.

J. ROSEMEYBR & G. DIVE. LONG BURNING ARC LAMP.

APPLICATION FILED MAR, 7, 1905.

2 SHEETS-SHEET 2.

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JOSEF ROSEMEYER, or LINDENTHAL, GERMANY, AND GUSTAVE DIVE, OF BRESSOUX,

' BELGIUM.

LONG-BURNING ABC-LAMP.

Specification of Letters Patent.

Patented Sept. 3, 1907.

Application filed March 7, 1905. Serial No. 248,798.

Prussia, German Empire, and Bressoux, near Liege, in

the Kingdom of Belgium, have invented certain new and useful Improvements in Long-Burning Arc-Lamps,

oi which'the following is a full, clear, and exact specification.

This invention relates to certain new and usefulimprovements in long burning 'arc jamps,v and the novelty resides in the peculiar construction, arrange-v ment and adaption of parts, all as more fully described shown in the drawings,-and then particularly pointed out in the claims. I

The new lamp is illustrated in the accompanying drawing as follows:

Figure 1 shows a longitudinal section through the" upper part of the lamp, the parts not relating to the present invention such as the resistance, the outer lamp cover, the outer transparentglobe and the reflector have been omitted. Fig. 2 is a section on the line A 13 of Fig. 1.

of Fig. 1. Fig. 3 is a section on the line CD Fig. 4 is a section on the line EF of Fig. 1. Fig.5 is a' longitudinal section through the lower part of the lamp.

The upper carbon is marked 1 and the lower carbon 2; 3 indicates the inner glass globe usually employed in long burning arc lamps, which globe surrounds the elec- I trio arc and protects the carbons from the action of the outer atmosphere. This globe 3 is hermetically connected with the casing 4 in the following manner: The

casing 4 is widened at its lower edge. In'this widening is disposed a ring 5 which is insulated by meansof the insulation layer fiirom the casing 4. The ring 5 has one side beveled to match the corresponding part of the lower expanded rim of the casing 4. .Underneath I the ring 5 there is arranged an annular disk 7 above and below which are placed asbestos washers 8 and 9.

The inner glass globe 3 is secured by means'of the threaded ring 10 which screws upon a threaded part oi the casing 4, and presses from below, with the interposition of an asbestos washer 11, against the widened upper edge of the globe 3 which in turn presses against the asbestos ring? so that an air-tight closure is obtained. The ring 5 bears a dish-shaped member 12 in the center of which is suspended the box 13 which serves as the guide for the positive carbon. The holder 15 for the negative carbon 2 is also supported from themember .12 by means of. rods 14, 14. At the top of the casing 4 is fixed the tube 16, which reaches 'upwardinto the internal cavity of the regulating magnet 17, and is'l'astened above to thecasing 18 surroundingthis magnet. The latter is borne-by the dome 19 .of burning is secured.

manufacture, in which combinationonly a single joining place, namely at 7 is absolutely necessary, sothat an extremely. good closure is secured for the electric arc and consequently an exceptionally long duration The entire lamp casing has only'one polarity and that the positive one. The negative current passes from the negativefcarbon 2 into the lower carbon holder 15 and through the rods14 and'the dish 12, to the ring 5 From thisring it passes 'by means of a, screw 21, which is mounted in an insulated ferrule 22 in the wall of the casing 4, through the conductor 23 to the resistance (not shown in the drawing). The positive current is supplied from the casing 4 by means of the wire 24 to the tube25, to which the core 260i the controlling magnet is connected above, which core again carries above a tube 27 serving as the upper carbon holder. The flexible metallic coil 28 which is preferably made of copper,

is inserted-between the clamping casing 30 and the plate 29which closed the tube 27 above. The carbon 1 is gripped above by means of the clamp 30, in the head of which the clamping plate 31 is screwed, which holds fast the lower end of the spirally wound wire 28, while ,the upper end of the latter is held fastby a terminal 32 which is screwed in the plate 29. If the carbon descends, the flexible wire ,28 extends and follows the motion of the carbonfso that current is supplied to it constantly and regularly. If a new carbon is inserted an excessive compression of the flexible connection is prevented by means of the bolt 33 which is secured to thebolt 31 and follows thisas the carbon sinks. On the insertion of a new carbon, however, the said bolt strikes against the upper terminal 32 and prevents the carbon from being pushed in too much.

It has been already indicated that the interior of the globe 3 and of the casing attached thereto is closed mrtightly. Obviously, however, care must be taken that the internal gases which become heated after the lamp is illuminated and consequently become expanded, can freely escape in order to prevent excessive internal pressure. This is effected in the well known manner by means of a thin .tube 34, which permits of the expansionof the interior gases but prevents, during the work- .ing of the lamp, the entrance of the outer atmosphere.

In order also to prevent entrance of air in the periods of inactivity there is provided a valve 35 in a channel 36, the little tube 34, Fig. 4 communicates with said channel,. is bent downwards and has underneath an exit aperture. The valve 35 closes by its own weight the channel 37 leading from the interior of the casing 4 to the channel 36, but when the lamp is in operation the valve is raised by the pressure of the expanding gases so thal the Connection with the tube 34 and thereby with the atmosphere is effected. If, however, the lamp is inactive, then the entrance of air into the interior of the lamp casing is prevented by said valve and thereby the great combustion of carbon at the Switching in of the lamp is checked.-- A washered cap 38 is necessary in order to admit of the insertion of the valve 35.

The clamping device which serves in the well known manner on the rising and falling of the magnet core 26 to grip the carbon and to raise it or to release it, so that it can slide along, is attached to the lower end of the tube 25, this lower end is constructed as a piston 39 which moves in the casing 4 as cylinder and serves to damp jerking motions. The clamping device con- 'sists of the three clamplevers 40, 41 and 42 which at their outer ends are connected together through the joints 43, 44 and 45 with the'piston 39, while the inner curve-shaped ends grip the carbon 1. If, in conse quence'of increasing resistance in the arc, the magnet core 26 sinks down, then the inner lower ends of the clamp levers 40, 41, A2 contact with a fixed plate 46 placed under the same, whereby the clamp levers are swung upwards owing to the weightoi the movable core coming'upon the pivots 50, and are thus moved out of engagement with the carbon 1 so that the carbon can slip. As the magnet core rises the clamping levers swing again downwards and thereby again grip the carbon, "so that the latter will be lifted. Obviously it is necessary that the curved shape of the lower edges of the clamp levers should be such that the above described action can take place. 'lnthis arrangement the device which, when the core rises, and the clamp levels 40, 41 and 42 swing together, secures under all circumstances the certain rippin oi the carbon is especially novel and important. This action is at- -tained by the central coiled spring 47 whichpresses above against the tube 25 and below againstthe plate 48. 'lhe latter is movable and rests upon the inner circle of the clamp levers 4G, 41 and 42.. This arrangementor the spring is the more sure because it also does not interfere with the play or the clamp levers if the spring should fail to operate for any reason, because in that case the clamp levers would nevertheless sink down by their own Weight. Obviously only one or two clamps might be used, but three have proved better in practice. I

in order that the core oi-the regulating magnet may be very sensitively regulated, friction in the guide must be avoided as much as possible. For this purpose 'the tube 27 which is attached above to the core 26, is guided by rollers 51, 52, 53 in order to diminish friction owing to the side pull of the magnet field, which is already 'well known. in connection with ordinary arc lamps. The spool core is equally supported from all sides and there is only the slight friction to be overcome see,

,formed of conducting material which occurs in the pivots of the bearings. The rollers 51, 52 and 53 are attached to the head of a projection 49 which is rigidly connected with the casing 18.

Having thus described my invention what I claim is: 1. In an arc lamp a casing of conducting material closed at one end and open at the other, provided with an aperture near the open end, a ring of insulating material in the latter end, an annular conducting member SUI,

ported in said insulating material, a lower carbon holder and having' a portion adapted to contact with said annular conducting member, an insulating bushing in said aperture, a conducting member extendlng'through said bushing into contact with said annular conducting member, and a globe iucloslng the carbon holder and secured to the casing. 2. In an arc lamp, a casing of conducting material closed at one end and open at the other, provided with an aperture near the open end, a ring of'lnsulatlng. material in the latterend, an annular conducting member supported In said insulating material, a lower ring formed of conductlng materlal and having a portion adapted to con tact with said annular conducting member, an insulatlng bushing in said aperture, a conducting member extending through said bushing into contact with sald'annular conducting member, and a globe inclosing the carbon holder and secured to the casing, and a guide for the positive carbon carried by the lower end of said ring. 3. In an arc lamp. a casing of conducting material closed at one end, and open at the other, provided with an aperture n ear th open end, a ring of insulating material in the latter end, an annular conducting member sup ported in said insulating material, a lower ring formed of conducting material-and having a portion adapted to Contact with said annular conducting member, an insulatlng bushing in said aperture, a conducting member ex tending through said bushing into contact with said annular conducting member, and a globe inclosing the carbon holder and secured to the casing, said ring being portcd in said insulating material, a lower ring formed of conducting material and having a portion adapted to contact with said annular conducting member, an insulating bushing in said aperture, a conducting member extending through said bushing into contact with said annular con ducting member,'and a globe inclosing the carbon bolder and secured to the casing, said ring being conical shaped, a guide for the positive carbon, carried by the lower end of said ring, and a holder for the negative carbon sup ported from said ring, said globe being held directly to the casing and hermetically connected therewith, and the insulated screw connected with the parts of negative polarity insulated within said casing.

In testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses.

JOSEF ROSICMEYER. GUS'LAYE DIVE.

Witnesses as to signature of Josef Rosemeyer;

WILLIAM Krrrlrrnnsf Gov Scrrvcz.

" Witnesses as to signature of; Gustave Dive:

THEUDUR Ha -ism, Gr-zorao lmrrn. 

